1. Department of Obstetrics and Gynaecology, Faculty of Medicine and Health Örebro University Örebro Sweden
2. Clinical Epidemiology and Biostatistics, School of Medical Sciences, Faculty of Medicine and Health Örebro University Örebro Sweden
3. Clinical Epidemiology Division, Department of Medicine, Solna Karolinska Institutet Stockholm Sweden
4. Department of Medicine, Faculty of Medicine and Health Örebro University Örebro Sweden
5. Department of Women's and Children's Health Uppsala University Uppsala Sweden
6. Faculty of Medicine Health Örebro University Örebro Sweden
7. School of Medicine Western Sydney University Campbelltown Australia